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Title: Association and Structure of Thermo Sensitive Comblike Block Copolymers in Aqueous Solutions

Abstract

The structures and association properties of thermo sensitive poly(methoxyoligo(ethylene glycol) norbornenyl esters) block copolymers in D2O were investigated by Small Angle Neutron Scattering (SANS). Each block is a comb-like polymer with a polynorbornene (PNB) backbone and oligo ethylene glycol (OEG) side chains (one side chain per NB monomer). The chemical formula of the block copolymer is (OEG3NB)79-(OEG6.6NB)67, where subscripts represent the degree of polymerization (DP) of OEG and NB in each block The polymer concentration was fixed at 2.0 wt % and the structural changes were investigated over a temperature range between 25 C and 68 C. It was found that at room temperature polymers associate to form micelles with a spherical core formed by the block (OEG3NB)79 and corona formed by the block (OEG6.6NB)67 and that the shape of the polymer in the corona could be described by the form factor of rigid cylinders. At elevated temperatures, the aggregation number increases and the micelles become more compact. At temperatures round the cloud point temperature (CPT) T = 60 C a correlation peak started to appear and became pronounced at 68 C due to the formation of a partially ordered structure with a correlation length ~ 349 .

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. ORNL
  2. National Institute of Standards and Technology (NIST)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Nanophase Materials Sciences
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
934465
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Macromolecules
Additional Journal Information:
Journal Volume: 41; Journal Issue: 13
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AQUEOUS SOLUTIONS; CLOUDS; COPOLYMERS; ESTERS; FORM FACTORS; GLYCOLS; NEUTRONS; POLYMERIZATION; POLYMERS; SCATTERING; SHAPE; SANS; Comb like polymers; micelles

Citation Formats

Cheng, Gang, Hua, Fengjun, Melnichenko, Yuri B, Hong, Kunlun, Wignall, George D, Mays, Jimmy, and Hammouda, B. Association and Structure of Thermo Sensitive Comblike Block Copolymers in Aqueous Solutions. United States: N. p., 2008. Web. doi:10.1021/ma702580v.
Cheng, Gang, Hua, Fengjun, Melnichenko, Yuri B, Hong, Kunlun, Wignall, George D, Mays, Jimmy, & Hammouda, B. Association and Structure of Thermo Sensitive Comblike Block Copolymers in Aqueous Solutions. United States. https://doi.org/10.1021/ma702580v
Cheng, Gang, Hua, Fengjun, Melnichenko, Yuri B, Hong, Kunlun, Wignall, George D, Mays, Jimmy, and Hammouda, B. Tue . "Association and Structure of Thermo Sensitive Comblike Block Copolymers in Aqueous Solutions". United States. https://doi.org/10.1021/ma702580v.
@article{osti_934465,
title = {Association and Structure of Thermo Sensitive Comblike Block Copolymers in Aqueous Solutions},
author = {Cheng, Gang and Hua, Fengjun and Melnichenko, Yuri B and Hong, Kunlun and Wignall, George D and Mays, Jimmy and Hammouda, B.},
abstractNote = {The structures and association properties of thermo sensitive poly(methoxyoligo(ethylene glycol) norbornenyl esters) block copolymers in D2O were investigated by Small Angle Neutron Scattering (SANS). Each block is a comb-like polymer with a polynorbornene (PNB) backbone and oligo ethylene glycol (OEG) side chains (one side chain per NB monomer). The chemical formula of the block copolymer is (OEG3NB)79-(OEG6.6NB)67, where subscripts represent the degree of polymerization (DP) of OEG and NB in each block The polymer concentration was fixed at 2.0 wt % and the structural changes were investigated over a temperature range between 25 C and 68 C. It was found that at room temperature polymers associate to form micelles with a spherical core formed by the block (OEG3NB)79 and corona formed by the block (OEG6.6NB)67 and that the shape of the polymer in the corona could be described by the form factor of rigid cylinders. At elevated temperatures, the aggregation number increases and the micelles become more compact. At temperatures round the cloud point temperature (CPT) T = 60 C a correlation peak started to appear and became pronounced at 68 C due to the formation of a partially ordered structure with a correlation length ~ 349 .},
doi = {10.1021/ma702580v},
url = {https://www.osti.gov/biblio/934465}, journal = {Macromolecules},
number = 13,
volume = 41,
place = {United States},
year = {2008},
month = {1}
}